Synchronizing system



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. UVV" 1 x I SYMHRONIZIG SYSTEM Filed lMay-2.1,. 1930v AAAA Patented Nov. 3, 1931 purposes of synchronization.

v mission of, for instance, a control frequency be inserte to a remote station. As the control frequen- 10, a resistance 11 in connection with 'a con` UNITED STATES PATENT OFFICE JOHANNES HEBBMANN, 0F BERLIN-HALENSEE, GFMANY, .ASBIGNOB T0 SIEMENS & HALSKE AKTIENGESELLSCHAFT, 0F SIEMENSSTADT, NEAR BERLIN, GERIANY, A CORPORATION 0F GERMANY SYNCHRONIZING SYSTEM Application tiled Hay 21, 1980, Serial No. 454,889, and in. Germany April 18, 1929.

The invention relates to a method for the tion of the arrangement disclosed in Fig. 2b utilization of the slot frequency of the armafor example. ture of commutator motors, for instance of the driving motors of picture tel aphy the armature D. C., which feeds te motor 1, apparatuses, as carrier frequency or thel is sent through the primary 2 of a transtransmission of signals, in particular for the former 3 from whose secondary 4 the slot frequency may be taken oii'. In Fig.'1b there Up tothe prent the alternating currents, is inserted instead of transformer 3 a reproduced in the armature and depending on 'sistance 5. The potential' drop across this the number of the slots and the number of .resistance varies inthe rhythm of the slot frerevolutions of the armature, were considered quency. For the blocking of the D. C., a as disturbing currents whose appearance was condenser 6 is provided. suppressed by various means, such as inclined ly the modification shown by Fig. 2a, the position of the slots, .more uniform distribu- D. feeding the armature of motor7 is sent, tion of the winding on the circumference of, as in Fig. 1a, through the primary 8 of a the armature. In smaller motors with few transformer-9 in whose secondary is connectamature slots, wherein such means for the ed aresistance 10. The potentia drop lacross suppression of the slot currents are not prothis resistance 10 isv conveyed over a conducvided, the ripple of the armature current may tor or the like to the motor to be maintained amount to 40%. The frequency of the slot in synchronism with the former motor, for alternating currents is found generall in instance the receiving motor of an installamotors with normal peripheral speed a ove tion for icture telegraphy. The secondary 300 cycles, and hence offers no diiiiculties to circuit of) transformer 9 is periodically shortthe transmission over telephone lines. circuited through a contact disk 20 coupled The method of synchronizing which has with driving motor 7. In this manner imbeen set forth according to the present inpulses are conveyed to the motor to be vention utilizes in simple manner the frewatched which corres ond'to the modulation quency given by the ripple of the armature of the slot frequency y means of the contact current as carrier frequency for the transdisk. In lace of transformer 9 there may dr; similar also instead of resistance cies lin question in this case are frequencies denser 12, respectively a transformer 13, as of the order of -150 cycles, they can no illustrated in Fig. 2b. longer be transmitted over telephone lines A further manner of application of the with intermediate repeaters. 'i' method .according to the invention is repre- Now referring to the drawings in Fig. 1a

Other objects and 'advantages of the insented in Fig. 3, wherein the D. C. motor 14 y.

vention will, of course, become apparent and is regulated in a manner known as such in thev suggest themselves to those skilled in the art prior art by means of a control frequency bly reading the following specification and conveyed to a relay 15, operating in connecc aims in connection with the accompanying tion with a resistance 16 connected in the ardrawings, wherein: mature circuit. The same control frequency Figs. 1a and 1b represent principles kof is brought'by means of the modulation of the circuit arrangements by means of which the slot frequency to another motor to be kept in slot fre uency may be sifted out of the arsynchronism. Themodulated slot frequenmature rect current; l cy is taken from the secondary side 17 of a Figs. 2a and 2b represent further modificatransformer 18 connected in parallel with a tions and disclose circuits wherein the slot eriodically brid ed over-resistance 416. frequency is modulated with another freor the blocking o? the D. C.,a'condenser,19 quency such as a controlling frequency; and is connected inthe circuit of the primary.

Fig. 3 represents still a furthel modifica- The transformer 18 conveys the slot freloo quency, modulated with the control freuency, directly to the receiving side or t rough a propriate amplifiers.

The em odiment according to Figs. 2a and 2b may also be used for the sendin of the impulse in devices which are contro led according to the start-stop system in the manner that for instance a contact disk or any other contact producing device is controlled bly the picture cylinder and gives the sync ronizing signal in the icture seam.

Instead of the trans ormers and resistances as shown use may also be made of choke coils in connection with condensers for the sifting and the retransmission of the slot frequencies.

The ripple of the armature current may be increased by slots in the poles of the exciter magnets.

The alternating currents of the slot frequency can also be utilized for the transmission of other than synchronizing signals, for instance at the starting and stopping of a picture transmission for the retransmission chronizing signals which comprises of telegraphic signals or during operation for transmission of start-stop signals or the 1 e.

Having now described my invention, what I claim and desire to secure by Letters Patent is the following M y 1. A method for the transmission :of s i driving a picture telegraph apparatus by a driving motor and producing from the driving motor a slot frequency foruse as a carrier frequency for synchronizingl signals c 2. In a system for the transmission of signals for synchronizing picture telegraph apparatus, a driving motor for'the picture telegraph transmitting "'lpparatus, and means for obtaining from said driving motor a slot frequency for use as a carrier frequency for transmitting synchronizing signals for use at a remote point. l

3. In a system for the transmission of s vnchronlzing signals, a commutator motor for drivlng picture telegraph apparatus at the polnt of transmission, means for obtainin from said commutator ymotor the slot frequency for use as the carrier frequency for,

synchronizing signals, and means for modulating the produced slot frequencies by acontrolledl frequency.

4. In a system for the transmission of syn- Y chronizing signals, a commutator motor for drlvmg picture telegraph apparatus at the point of transmission, means for obtaining Vfrom said commutator motor the slot frequency for use of a carrier frequency of synchronizing signals, and a contact establishing device coupled with the driving motor for modulating said slot frequency.

5. In a picture telegraph apparatus, means for synchronizing remotely spaced rotary bodies Swhich comprises a commutator motor for driving local picture telegraph apparatus, means for filtering the slot fre uency of the armature current of said motor or use as a carrier frequency of synchronizing signals,

and a current interruptin device associated with said slot frequency tering means for interruptin the said frequency a predetermined num r of times per revolutions of the motor for modulating the slot frequency at the rhythm of the control frequency.

6. In a system for producing signals ,for synchronizing remotely space bodies for use in connection with picture telegraph apriving loo 

